//
// Copyright(C) 1993-1996 Id Software, Inc.
// Copyright(C) 2005-2014 Simon Howard
//
// This program is free software; you can redistribute it and/or
// modify it under the terms of the GNU General Public License
// as published by the Free Software Foundation; either version 2
// of the License, or (at your option) any later version.
//
// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
// GNU General Public License for more details.
//
// DESCRIPTION:
//  System specific interface stuff.
//


#ifndef __R_MAIN__
#define __R_MAIN__

#include "d_player.h"
#include "r_data.h"




//
// POV related.
//
extern fixed_t      viewcos;
extern fixed_t      viewsin;

extern int      viewwindowx;
extern int      viewwindowy;



extern int      centerx;
extern int      centery;

extern fixed_t      centerxfrac;
extern fixed_t      centeryfrac;
extern fixed_t      projection;

extern int      validcount;

extern int      linecount;
extern int      loopcount;


//
// Lighting LUT.
// Used for z-depth cuing per column/row,
//  and other lighting effects (sector ambient, flash).
//

// Lighting constants.
// Now why not 32 levels here?
#define LIGHTLEVELS         16
#define LIGHTSEGSHIFT            4

#define MAXLIGHTSCALE       48
#define LIGHTSCALESHIFT     12
#define MAXLIGHTZ          128
#define LIGHTZSHIFT     20

extern lighttable_t*    scalelight[LIGHTLEVELS][MAXLIGHTSCALE];
extern lighttable_t*    scalelightfixed[MAXLIGHTSCALE];
extern lighttable_t*    zlight[LIGHTLEVELS][MAXLIGHTZ];

extern int      extralight;
extern lighttable_t*    fixedcolormap;


// Number of diminishing brightness levels.
// There a 0-31, i.e. 32 LUT in the COLORMAP lump.
#define NUMCOLORMAPS        32


// Blocky/low detail mode.
//B remove this?
//  0 = high, 1 = low
extern  int     detailshift;


//
// Function pointers to switch refresh/drawing functions.
// Used to select shadow mode etc.
//
extern void     (*colfunc) (void);
extern void     (*transcolfunc) (void);
extern void     (*basecolfunc) (void);
extern void     (*fuzzcolfunc) (void);
// No shadow effects on floors.
extern void     (*spanfunc) (void);


//
// Utility functions.
int
R_PointOnSide
( fixed_t   x,
  fixed_t   y,
  node_t*   node );

int
R_PointOnSegSide
( fixed_t   x,
  fixed_t   y,
  seg_t*    line );

angle_t
R_PointToAngle
( fixed_t   x,
  fixed_t   y );

angle_t
R_PointToAngle2
( fixed_t   x1,
  fixed_t   y1,
  fixed_t   x2,
  fixed_t   y2 );

fixed_t
R_PointToDist
( fixed_t   x,
  fixed_t   y );


fixed_t R_ScaleFromGlobalAngle (angle_t visangle);

subsector_t*
R_PointInSubsector
( fixed_t   x,
  fixed_t   y );

void
R_AddPointToBox
( int       x,
  int       y,
  fixed_t*  box );



//
// REFRESH - the actual rendering functions.
//

// Called by G_Drawer.
void R_RenderPlayerView (player_t *player);

// Called by startup code.
void R_Init (void);

// Called by M_Responder.
void R_SetViewSize (int blocks, int detail);

#endif
